How many movies have Joe Gall and Sander Schwartz collaborated on?

They have worked on 5 movies together! Their first movie together was Scooby-Doo! and the Legend of the Vampire (2003) while their highest rated movie together was Teen Titans: Trouble in Tokyo (2006). They have not worked together since Superman: Doomsday (2007). They are most known for their animation films together.